Rather than performing one large adjustment, try applying a couple of smaller adjustments. Once satisfied, close the RTP and drag the New Instance icon (the icon at the lower-left of the ArcsinhStretch window) to your image to execute the stretch Adjust the upper or lower slider for the Black Point until the highlighted areas disappear (the upper slider is the coarse slider and the lower slider is the fine slider)Ħ. Note that you may have to apply ArcsinhStretch in a couple of iterations to get the desired result.ĥ. Move the slider for the Stretch Factor to the right until you start to see the color in your image and adjust to taste. You can use this information about clipped pixels to adjust your image later.Ĥ. You may see some colors show up on your image when you click the button – these are areas where the black level is clipped (set to zero), as shown: Once the RTP is open, the button labeled ‘Estimate Black Point’ becomes active and you can click it to have the process estimate your image’s black point. ArcsinhStretch has a real-time preview (RTP), so click it to enable the RTP (the circle icon at the bottom-left of the ArcsinhStretch window).ģ. Start the ArcsinhStretch process by selecting from the menu Process – IntensityTransformations – ArcsinhStretch or locate it under in the Process menu.Ģ.
Set the sliders for each of the red, blue, and green to 1.0.If not already selected, select the RGB image at the top of the RGBWorkingSpace window:.Ensure you have an RGB image open on your PixInsight desktop and start the process by selecting Process – ColorSpaces – RGBWorkingSpace or locate it under in the Process menu.This is why you might consider running BackgroundNeutralization and ColorCalibration before using this process. Set the RGBWorkingSpace so that all channels are equalįollowing the steps in this section won’t make a difference to how your image is displayed however, it does affect PixInsight’s calculations.You have to do a couple of things before using ArcsinhStretch: If you are using another Linux distro, you can build PHD2 from source: Building PHD2 on Linux.ArcsinhStretch is a unique process in PixInsight because you can only use it with RGB data and it focuses on preserving color information. Patrick Chevalley has PHD2 Ubuntu packages hosted on Launchpad.
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For older versions of macOS, install the 32-bit version. macOS downloadsįor macOS 10.14 Mojave and newer, install the 64-bit version of PHD2.
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Note for Gemini/Gemini2 ASCOM users: PHD2 requires Gemini ASCOM Driver Version 1.0.56.0 or newer. If you do uninstall the older version, you will remove all your profiles and settings. There is no need to uninstall the older version first. Upgrading from an earlier version of PHD2 The development builds are updated more frequently than the general releases below. We recommend running the latest development snapshot build to get the latest bug fixes and enhancements.
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